Going from Factory NPP exhaust to..... - Camaro5 Chevy Camaro Forum / Camaro ZL1, SS and V6 Forums

blkngldbabe · 04-21-2014, 01:42 PM

Hey all. I'm trying to source some exhaust for a client. He wants more rumble but has the dual tailpipe NPP exhaust from the factory. Any suggestions that has two tailpipes per side? Any help would be greatly appreciated.

3rdgen3 · 04-21-2014, 02:40 PM

Quote:

Originally Posted by blkngldbabe

Hey all. I'm trying to source some exhaust for a client. He wants more rumble but has the dual tailpipe NPP exhaust from the factory. Any suggestions that has two tailpipes per side? Any help would be greatly appreciated.

I would start with pulling the fuse for the NPP Dual mode flaps, that way they are always open. Its a noticeable difference.

If he wants more rumble then that, SOLO high-flow catted mid-pipes with the stock NPP gives the most noticeable increase in rumble AND performance.

blkngldbabe · 04-21-2014, 02:49 PM

Thanks for that. He was interested in the SLP LMII setup but they only have single tailpipe's available currently.

Dynamite · 04-21-2014, 02:55 PM

Get whatever exhaust the client wants and weld on the tips.

Like these:

http://tips.byethost4.com/dualpair.html

TuscaniGTSC2 · 04-21-2014, 03:01 PM

Leave the cat back and add headers. He will be grinning ear to ear. I know I am!

blkngldbabe · 04-21-2014, 03:20 PM

Thanks!!! Love the ideas, peeps. Keep em coming. I want to offer this guy as many options as possible.

Camarodriver2 · 04-21-2014, 03:30 PM

I have a 2011 SS, L99. I added Doug Thorley muffler delete pipes for $250. You'll need to cut off the chrome pipe and add the dual tips. Extra $50 for a muffler shop to expand the pipes so they could be pushed on. This sound great for the least amount of $$. My is stock though - if they're going to go with headers or x pipe, you won't want muffler delete.

JDP Sales · 04-21-2014, 04:05 PM

Any cat-back designed for the ZL1 will work and has quad tips as well. I agree with just adding headers though.

Best regards,

Tyler
888-308-6007

maddoggyusa · 04-21-2014, 04:17 PM

you don't muffler delete the dual mode system. like 3rdgen says, pulling the fuse will keep it in straight thru exhaust all the time (instead of opening over 3k rpm). very few aftermarket systems will sound this good.

high flow cats are nice but as you know will void your warranty and depending on your state could cause you some inspection issues (not to mention get you trouble).

If it's still not loud enough, I'd add headers.

ilirg · 04-21-2014, 04:31 PM

Add high flow cats, it will sound amazing.

ST1LE · 04-21-2014, 05:01 PM

The Stainless Works Retro Chambered Cat Back sounds great, but is well north of a grand and I cant say it sounds better than the NPP as I havent heard them side by side.

This youtube video is a good one to show the improvement headers makes, second to none in my opinion, I cant get enough of mine.

BenningJ · 04-21-2014, 08:52 PM

I just put long tube headers on my car with the NPP exhaust option. LOVE it! Perfect amount of loud and yet zero drone, couple that with the Mild2Wild controller keeping the neighbors happy too.

trw427ss · 04-22-2014, 12:35 AM

Here is a NPP with LT headers.

With a mild to wild switch.

Scott@Bjorn3D · 04-22-2014, 05:58 AM

You need to ask the client does he want to keep his drivetrain warranty first. If he does you could add Solo High Flow Cats, it will really make a big difference in sound and give you a little bit more power to the wheels. The other option is Kooks Long Tube Headers with their Green Cats. They are not supposed to throw a Check Engine Light. That will get him great sound and about 25 more HP to the back wheels without a tune. Once he does not care about his warranty he can tune those headers and be at 40+ HP at the back wheels.

04-21-2014, 01:42 PM	#1
blkngldbabe Barossa's handler Drives: 2LT/RS RJT Join Date: Mar 2010 Location: Highland Chev,Aurora Ontario Posts: 1,097	Going from Factory NPP exhaust to..... Hey all. I'm trying to source some exhaust for a client. He wants more rumble but has the dual tailpipe NPP exhaust from the factory. Any suggestions that has two tailpipes per side? Any help would be greatly appreciated. __________________ SLP's GTA Master Specialty Vehicle and Master Parts Dealer

04-21-2014, 02:49 PM	#3
blkngldbabe Barossa's handler Drives: 2LT/RS RJT Join Date: Mar 2010 Location: Highland Chev,Aurora Ontario Posts: 1,097	Thanks for that. He was interested in the SLP LMII setup but they only have single tailpipe's available currently. __________________ SLP's GTA Master Specialty Vehicle and Master Parts Dealer

04-21-2014, 02:55 PM	#4
Dynamite Drives: 2013 Camaro 2SS/RS XD Join Date: May 2012 Location: Washington, D.C. Posts: 522	Get whatever exhaust the client wants and weld on the tips. Like these: http://tips.byethost4.com/dualpair.html __________________ 2013 Black 2SS Camaro - NPP Exhaust - Rotofab Cold Air Intake - SWorks Stainless Power Long Tube Headers 1 7/8" - CNC Ported Throttle Body - Showstopper Sidemarkers Ghosted Black - Sequential Tail Lights - RX Catch Can - Hill Start Assist Disabled- 35% Tint - Heritage Grille - BTR Stage 4 Cam - 3.91 Gears

04-21-2014, 03:20 PM	#6
blkngldbabe Barossa's handler Drives: 2LT/RS RJT Join Date: Mar 2010 Location: Highland Chev,Aurora Ontario Posts: 1,097	Thanks!!! Love the ideas, peeps. Keep em coming. I want to offer this guy as many options as possible. __________________ SLP's GTA Master Specialty Vehicle and Master Parts Dealer

04-21-2014, 08:52 PM	#12
BenningJ Drives: 2013 AGM 1SS/RS LS3 Join Date: Mar 2011 Location: Cedar Falls, Iowa Posts: 1,581 View My Garage	I just put long tube headers on my car with the NPP exhaust option. LOVE it! Perfect amount of loud and yet zero drone, couple that with the Mild2Wild controller keeping the neighbors happy too. __________________ 2013 Camaro 1SS/RS - Ashen Gray Metallic \| LS3 \| CAI Inductions, Inc Intake \| Vmax Ported Throttle Body \| Dynatech 1.875" Long Tube Headers \| Apex Scoop & Washer Bottle Relocation \| Lethal Racing Night Fury Cam \| BTR 7.400" Push Rods \|LS2 Dampener \| Melling 10296 Oil Pump \| IWIS Chain \| BTR .660" Dual Valve Springs \| BTR Trunion Upgrade Kit \| Lethal Racing Tuned \| Anvil Notch Spoiler \| BMR Split Drop Springs \| Eaton TrueTrac \| GM 3.91 Gears \| LPW Diff Cover \| Rohana RF2 275/40 20x10F 315/35 20x11R \| BMR Polyurethane Motor Mounts

04-21-2014, 03:01 PM	#5
TuscaniGTSC2 Drives: 2011 Black 1SS Join Date: Mar 2013 Location: Fort Wayne Indiana Posts: 72	Leave the cat back and add headers. He will be grinning ear to ear. I know I am!

04-21-2014, 03:30 PM	#7
Camarodriver2 Drives: FOR SALE! Bumblebee 1 of 1 Join Date: May 2010 Location: Geneva IL Posts: 530 View My Garage	I have a 2011 SS, L99. I added Doug Thorley muffler delete pipes for $250. You'll need to cut off the chrome pipe and add the dual tips. Extra $50 for a muffler shop to expand the pipes so they could be pushed on. This sound great for the least amount of $$. My is stock though - if they're going to go with headers or x pipe, you won't want muffler delete.

04-21-2014, 04:05 PM	#8
JDP Sales Drives: Chevys at the limit Join Date: Nov 2010 Location: SLC, UT Posts: 9,621	Any cat-back designed for the ZL1 will work and has quad tips as well. I agree with just adding headers though. Best regards, Tyler 888-308-6007

04-21-2014, 04:17 PM	#9
maddoggyusa Drives: 2013 Camaro Dusk 2SS/6 Join Date: Sep 2013 Location: New Jersey Posts: 1,586	you don't muffler delete the dual mode system. like 3rdgen says, pulling the fuse will keep it in straight thru exhaust all the time (instead of opening over 3k rpm). very few aftermarket systems will sound this good. high flow cats are nice but as you know will void your warranty and depending on your state could cause you some inspection issues (not to mention get you trouble). If it's still not loud enough, I'd add headers.

04-21-2014, 04:31 PM	#10
ilirg Drives: 2011 Camaro 2ss Join Date: May 2013 Location: nj Posts: 1,559	Add high flow cats, it will sound amazing.

04-22-2014, 05:58 AM	#14
Scott@Bjorn3D Drives: Kami, 2013 2SS LS3 Luvin Join Date: Oct 2008 Location: Eufaula, Alabama Posts: 6,427	You need to ask the client does he want to keep his drivetrain warranty first. If he does you could add Solo High Flow Cats, it will really make a big difference in sound and give you a little bit more power to the wheels. The other option is Kooks Long Tube Headers with their Green Cats. They are not supposed to throw a Check Engine Light. That will get him great sound and about 25 more HP to the back wheels without a tune. Once he does not care about his warranty he can tune those headers and be at 40+ HP at the back wheels.